Shutter control system and image apparatus including the same

ABSTRACT

An image apparatus with reduced three-dimensional (3D) crosstalk includes a shutter control system including an infrared (IR) signal transmitter configured to receive from a display device for displaying two or more light-off sections and two or more light-on sections arranged alternately in one image frame, information corresponding to the light-off sections and the light-on sections, and to output an IR signal corresponding to the information, the IR signal corresponding to a start of a first light-off section of the light-off sections in the image frame, and a shutter controller configured to receive the IR signal, and to control opening or closing of a left shutter and a right shutter in accordance with the IR signal.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional of U.S. patent application Ser. No.13/315,097, filed Dec. 8, 2011, which claims priority to and the benefitof Korean Patent Application No. 10-2011-0000589, filed Jan. 4, 2011,the entire content of both of which is incorporated herein by reference.

BACKGROUND

1. Field

The present invention relates to a shutter control system and an imageapparatus including the same.

2. Description of Related Art

In general, primary factors that cause a human to perceive astereoscopic effect are a physiological factor and an experientialfactor. In a three-dimensional (3D) image displaying technology,binocular parallax is generally used to express the stereoscopic effectof an object. The binocular parallax is a primary factor of recognizingthe stereoscopic effect at short distances. In order to express thestereoscopic effect of an object, binocular parallax achieved byalternately opening or closing a left shutter and a right shutter of 3Dglasses may be used.

When the left and right shutters of the 3D glasses are alternatelyopened or closed, a response time of a shutter to a control signal andthe on/off speed of the shutter itself may cause 3D crosstalk.

SUMMARY

Aspects of embodiments of the present invention provide a shuttercontrol system which can reduce three-dimensional (3D) crosstalk.

Aspects of embodiments of the present invention also provide an imageapparatus including the shutter control system to reduce 3D crosstalk.

However, aspects of embodiments of the present invention are notrestricted to the one set forth herein. The above and other aspects ofembodiments of the present invention will become more apparent to one ofordinary skill in the art to which embodiments of the present inventionpertains by referencing the detailed description of embodiments of thepresent invention given below.

According to an aspect of embodiments of the present invention, there isprovided a shutter control system including an infrared (IR) signaltransmitter configured to receive from a display device for displayingtwo or more light-off sections and two or more light-on sectionsarranged alternately in one image frame, information corresponding tothe light-off sections and the light-on sections, and to output an IRsignal corresponding to the information, the IR signal corresponding toa start of a first light-off section of the light-off sections in theimage frame, and a shutter controller configured to receive the IRsignal, and to control opening or closing of a left shutter and a rightshutter in accordance with the IR signal.

The one image frame may include the first light-off section, a firstlight-on section, a second light-off section, and a second light-onsection arranged sequentially in this order, and a rising edge of the IRsignal may correspond to the start of the first light-off section.

The shutter controller may be configured to control the left shutter tobe opened while controlling the right shutter to be closed when the IRsignal is in a high state, and may be configured to control the rightshutter to be opened while controlling the left shutter to be closedwhen the IR signal is in a low state.

A section in which the left shutter is opened while the right shutter isclosed may overlap the first light-off section, and a section in whichthe right shutter is opened while the left shutter is closed may overlapthe second light-off section.

According to another aspect of embodiments of the present invention,there is provided an image apparatus including a voltage generatorconfigured to generate a first voltage and a second voltage, the secondvoltage having two or more high states and two or more low states in oneimage frame, a display unit including a plurality of pixels configuredto receive the first and second voltages, a data signal, and a gatesignal, and configured to be lit or unlit corresponding to the first andsecond voltages, the data signal, and the gate signal, a controllerconfigured to receive the second voltage and to output a feedback signalcorresponding to at least one of a rising edge or a falling edge of thesecond voltage, an IR signal transmitter configured to receive thefeedback signal and to output an IR signal corresponding to at least oneof the rising edge or the falling edge of the second voltage, andshutter glasses including a left shutter, a right shutter, and a shuttercontroller that is configured to receive the IR signal and to controlopening or closing of the left shutter and the right shuttercorresponding to the IR signal.

Each of the pixels may be configured to be unlit when receiving thesecond voltage in the high state, and may be configured to be lit whenreceiving the second voltage in the low state.

The first voltage may include ELVDD, and the second voltage may includeELVSS.

The second voltage may have a first rising edge, a first falling edge, asecond rising edge, and a second falling edge, the IR signal may risecorresponding to the first rising edge of the second voltage and remainin the high state, and may fall corresponding to the second rising edgeof the second voltage and remain in the low state.

The shutter controller of the shutter glasses may be configured tocontrol the left shutter to be opened while controlling the rightshutter to be closed corresponding to a rising edge of the IR signal,and may be configured to control the right shutter to be opened whilecontrolling the left shutter to be closed corresponding to a fallingedge of the IR signal.

A section in which the left shutter is opened while the right shutter isclosed may be between the first rising edge and the first falling edgeof the second voltage, and a section in which the right shutter isopened while the left shutter is closed may be between the second risingedge and the second falling edge of the second voltage.

According to another embodiment of the present invention, there isprovided an image apparatus including a voltage generator configured togenerate a first voltage and a second voltage, the second voltage havingtwo or more high states and two or more low states in one image frame, adisplay unit including a plurality of pixels configured to receive thefirst and second voltages, a data signal, and a gate signal, andconfigured to be lit or unlit corresponding to the first and secondvoltages, the data signal, and the gate signal, a controller configuredto receive information about a delay time from a user and to output afeedback signal corresponding to the information, an IR signaltransmitter configured to receive the feedback signal and to output anIR signal, the IR signal corresponding to at least one of a rising edgeor a falling edge of the second voltage, and shutter glasses including aleft shutter, a right shutter, and a shutter controller configured toreceive the IR signal, and to control opening or closing of the leftshutter and the right shutter corresponding to the IR signal.

Each of the pixels may be configured to be unlit when receiving thesecond voltage in the high state, and may be configured to be lit whenreceiving the second voltage in the low state.

The first voltage may include ELVDD, and the second voltage may includeELVSS.

The controller may be configured to receive user inputted informationcorresponding to the delay time in units of 0.01 to 0.05 ms.

The controller may be configured to output the feedback signal uponreceiving the user inputted information, the feedback signal beingshifted from a starting point of the image frame by the delay time.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects and features of the present invention willbecome more apparent by describing in detail exemplary embodimentsthereof with reference to the attached drawings, in which:

FIG. 1 is a block diagram of a shutter control system according to anexemplary embodiment of the present invention;

FIG. 2 is an operational timing diagram of the shutter control systemaccording to the exemplary embodiment of FIG. 1;

FIG. 3 is a block diagram of an image apparatus according to anexemplary embodiment of the present invention;

FIG. 4 is a circuit diagram of one pixel included in the image apparatusaccording to the exemplary embodiment of FIG. 3;

FIG. 5 is an operational timing diagram of the image apparatus accordingto the exemplary embodiment of FIG. 3;

FIGS. 6 and 7 are diagrams for explaining how display units included inimage apparatuses according to the exemplary embodiment of FIG. 3 and amodified embodiment of the exemplary embodiment of FIG. 3 displayimages; and

FIG. 8 is a block diagram of an image apparatus according to anotherexemplary embodiment of the present invention.

DETAILED DESCRIPTION

Aspects and features of embodiments according to the present inventionand methods of accomplishing the same may be understood more readily byreference to the following detailed description of exemplary embodimentsand the accompanying drawings. The present invention may, however, beembodied in many different forms and should not be construed as beinglimited to the embodiments set forth herein. Rather, these embodimentsare provided so that this disclosure will be thorough and complete andwill fully convey the concept of the invention to those skilled in theart, and the present invention will be defined by the appended claimsand their equivalents. In the drawings, sizes and relative sizes ofelements may be exaggerated for clarity. Like reference numerals referto like elements throughout the specification. As used herein, the term“and/or” includes any and all combinations of one or more of theassociated listed items.

The terminology used herein is for the purpose of describing particularembodiments and is not intended to be limiting of the invention. As usedherein, the singular forms are intended to include the plural forms aswell, unless the context clearly indicates otherwise. It will be furtherunderstood that the terms “comprises” and/or “made of,” when used inthis specification, specify the presence of stated components, steps,operations, and/or elements, but do not preclude the presence oraddition of one or more other components, steps, operations, elements,and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this invention belongs. It will befurther understood that terms, such as those defined in commonly useddictionaries, should be interpreted as having a meaning that isconsistent with their meaning in the context of the relevant art, andwill not be interpreted in an idealized or overly formal sense unlessexpressly so defined herein.

Hereinafter, a shutter control system according to an exemplaryembodiment of the present invention will be described with reference toFIGS. 1 and 2.

FIG. 1 is a block diagram of a shutter control system 300 according toan exemplary embodiment of the present invention. FIG. 2 is anoperational timing diagram of the shutter control system 300 accordingto the exemplary embodiment of FIG. 1.

Referring to FIG. 1, the shutter control system 300 may include aninfrared (IR) signal transmitter 100 and a shutter controller 200.

The IR signal transmitter 100 may receive from a display device, whichhas two or more light-off sections and two or more light-on sectionsarranged alternately in one image frame, information about the light-offsections and the light-on sections, and may output an IR signal IRsync,which is synchronized with a start of a first light-off section in theimage frame, based on the received information.

Specifically, referring to FIG. 2, the IR signal transmitter 100receives from a display device, which has two or more (for example, two)light-off sections (X sections of an image signal) and two or more (forexample, two) light-on sections (0 sections of the image signal)arranged alternately in one image frame, information about the light-offsections (the X sections of the image signal) and the light-on sections(the O sections of the image signal) in the form of a feedback signalCONT_IR. Based on the received feedback signal CONT_IR, the IR signaltransmitter 100 outputs the IR signal IRsync, which is synchronized witha start of a first light-off section (a first X section of the imagesignal).

If the light-off sections (the X sections of the image signal) and thelight-on sections (the O sections of the image signal) illustrated inFIG. 2 are a first light-off section (a first X section of the imagesignal), a first light-on section (a first O section of the imagesignal), a second light-off section (a second X section of the imagesignal) and a second light-on section (a second O section of the imagesignal) arranged sequentially in this order, the IR signal transmitter100 outputs the IR signal IRsync, whose rising edge Re is synchronizedwith a start of the first light-off section (the first X section of theimage signal). In other words, the IR signal transmitter 100 can shiftthe IR signal IRsync forward or backward such that the start of thefirst light-off section (the first X section of the image signal)coincides with the rising edge Re of the IR signal IRsync.

Referring back to FIG. 1, the shutter controller 200 may receive the IRsignal IRsync and control a left shutter 230 and a right shutter 240 tobe opened or closed (turned on or off) based on the received IR signalIRsync. In the shutter control system 300 according to the currentexemplary embodiment, the shutter controller 200 may, for example, beincluded in shutter glasses 250 (see FIG. 3). However, the presentinvention is not limited to this example. The shutter controller 200 mayalso be included in visualization tools other than glasses.

The shutter controller 200 may include an IR signal receiver 210 and ashutter on/off controller 220.

The IR signal receiver 210 may receive the IR signal IRsync and output acontrol signal CONT_S for controlling the shutter on/off controller 220based on the IR signal IRsync. The shutter on/off controller 220 mayreceive the control signal CONT_S and directly control the left shutter230 and the right shutter 240 to be opened or closed (turned on or off).The configuration of the shutter controller 200 is a mere example usedto implement an embodiment of the present invention, and the presentinvention is not limited to the configuration illustrated in FIG. 1.

Referring back to FIG. 2, the shutter controller 200 may receive the IRsignal IRsync in a high state (e.g., a logic “1” state) and, based onthe received IR signal IRsync in the high state, control the leftshutter 230 to be opened while controlling the right shutter 240 to beclosed. In addition, the shutter controller 200 may receive the IRsignal IRsync in a low state (e.g., a logic “0” state) and, based on thereceived IR signal IRsync, control the right shutter 240 to be openedwhile controlling the left shutter 230 to be closed.

Here, it should be noted that a section t_on/off_(—)1 in which the leftshutter 230 is opened while the right shutter 240 is closed overlaps thefirst light-off section (the first X section of the image signal) andthat a section t_on/off_(—)2 in which the right shutter 240 is openedwhile the left shutter 230 is closed overlaps the second light-offsection (the second X section of the image signal).

More specifically, the section t_on/off_(—)1 in which the left shutter230 is opened while the right shutter 240 is closed may consist of adelay section d, which is from when the left shutter 230 receives acommand to when the left shutter 230 actually starts to be opened, asection t_on, which is required to open the left shutter 230, and asection t_off, which is required to close the right shutter 240. Sinceall of the above sections overlap the first light-off section (the firstX section of the image signal) during which an image is not displayed,three-dimensional (3D) crosstalk caused by shutter opening or closingcan be reduced or minimized.

The section t_on/off_(—)2 in which the right shutter 240 is opened whilethe left shutter 230 is closed may consist of a delay section d, whichis from when the right shutter 240 receives a command to when the rightshutter 240 actually starts to be opened, a section t_on, which isrequired to open the right shutter 240, and a section t_off, which isrequired to close the left shutter 230. Since all of the above sectionsoverlap the second light-off section (the second X section of the imagesignal) during which an image is not displayed, 3D crosstalk caused byshutter opening or closing can be reduced or minimized. That is, theshutter control system 300 according to the current exemplary embodimentcan reduce or minimize a response time d of a shutter to the IR signalIRsync and 3D crosstalk caused by the on/off speed (t_on/t_off) of theshutter itself.

Hereinafter, an image apparatus including this shutter control system300 according to an exemplary embodiment of the present invention willbe described with reference to FIGS. 3 through 7.

FIG. 3 is a block diagram of an image apparatus according to anexemplary embodiment of the present invention. FIG. 4 is a circuitdiagram of one pixel included in the image apparatus according to theexemplary embodiment of FIG. 3. FIG. 5 is an operational timing diagramof the image apparatus according to the exemplary embodiment of FIG. 3.FIGS. 6 and 7 are diagrams for explaining how display units 500 includedin image apparatuses according to the exemplary embodiment of FIG. 3 anda modified embodiment of the exemplary embodiment of FIG. 3 displayimages.

The image apparatus according to the current exemplary embodiment willhereinafter be described using an image apparatus including a displaydevice, which is illustrated in FIGS. 3 and 4, and which has organiclight-emitting diodes, as an example. However, the present invention isnot limited to this display device. In addition, the block configurationof FIG. 3 is merely an example and does not limit the scope of thepresent invention. Lastly, a detailed description of elements identicalto the above-described elements of the shutter control system 300according to the exemplary embodiment of FIG. 1 will be omitted, and thefollowing description will focus on other elements. Like referencenumerals in the drawings denote like elements, and thus, theabove-described features of the shutter control system 300 according tothe exemplary embodiment of FIG. 1 may be incorporated and claimed inthe following image apparatus.

Referring to FIG. 3, the image apparatus according to the currentexemplary embodiment may include an image signal controller 410, atiming controller 420, a gate driver 430, a data driver 440, a voltagegenerator 450, the display unit 500, and a shutter control system 300.

The image signal controller 410 may provide a vertical synchronizationsignal Vsync, a horizontal synchronization signal Hsync, and an imagesignal Data to the timing controller 420. In addition, the image signalcontroller 410 may receive a feedback control signal CONT_F from thetiming controller 420 and provide a feedback signal CONT_IR to an IRsignal transmitter 100. While the image signal controller 410 receivesthe feedback control signal CONT_F from the timing controller 420 andtransmits the feedback signal CONT_IR to the IR signal transmitter 100in FIG. 3, the timing controller 420 may also transmit the feedbacksignal CONT_IR directly to the IR signal transmitter 100 when necessary.

The timing controller 420 may receive the vertical synchronizationsignal Vsync, the horizontal synchronization signal Hsync and the imagesignal Data from the image signal controller 410, and may transmit theimage signal Data and a data driver control signal CONT1 to the datadriver 440 so as to control the data driver 440 to transmit data signalsD1 through Dm to the display unit 500 on a predetermined cycle (e.g., inevery cycle of the vertical synchronization signal Vsync). In addition,the timing controller 420 may transmit a gate driver control signalCONT2 to the gate driver 430 so as to control the gate driver 430 totransmit gate signals G1 through Gn to the display unit 500 on apredetermined cycle (e.g., in every period of the horizontalsynchronization signal Hsync).

The gate driver 430 may be controlled by the timing controller 420 andmay transmit the gate signals G1 through Gn to a plurality of gate linesof the display unit 500 on a predetermined cycle (e.g., in every cycleof the horizontal synchronization signal Hsync). Likewise, the datadriver 440 may be controlled by the timing controller 420 and maytransmit the data signals D1 through Dm to a plurality of data lines ofthe display unit 500 on a predetermined cycle (e.g., in every cycle ofthe vertical synchronization signal Vsync). The voltage generator 450generates a voltage for driving a plurality of pixels 510 included inthe display unit 500. For example, the voltage generator 450 maygenerate a first voltage ELVDD and a second voltage ELVSS, and may applythe first voltage ELVDD and the second voltage ELVSS to the pixels 510of the display unit 500.

The display unit 500 may include the pixels 510. Referring to FIG. 4,each of the pixels 510 may include an organic light-emitting diode OLED,a first transistor M1 (i.e., a driving transistor), a storage capacitorCst, and a second transistor M2 (i.e., a switching transistor), whichare coupled to a gate line Gi and a data line Dj.

In the embodiment of FIG. 4, the first transistor M1 has a gateelectrode coupled to the gate line Gi, a first electrode coupled to thedata line Dj, and a second electrode coupled to a first terminal of thestorage capacitor Cst. Here, the first electrode may be set to be asource electrode or a drain electrode, and the second electrode may beset to be the other one of the source electrode and the drain electrode.When receiving a gate signal from the gate line Gi, the first transistorM1 coupled to the gate line Gi and the data line Dj may be turned on totransmit a data signal received from the data line Dj to the storagecapacitor Cst. Here, the storage capacitor Cst may be charged with avoltage corresponding to the data signal.

The second transistor M2 has a gate electrode coupled to the firstterminal of the storage capacitor Cst, and may be supplied with thefirst voltage ELVDD through a first electrode. In addition, a secondelectrode of the second transistor M2 is coupled to a second terminal ofthe storage capacitor Cst and an anode electrode of the organiclight-emitting diode OLED. Based on a value of voltage stored in thestorage capacitor Cst, the second transistor M2 may control the amountof current that flows from a terminal to which the first voltage ELVDDis applied to a terminal to which the second voltage ELVSS is appliedvia the organic light-emitting diode OLED.

In the current exemplary embodiment, the second voltage ELVSS may havetwo or more (for example, two) high states (logic 1 states) and two ormore (for example, two) low states (logic 0 states) within one imageframe. The organic light-emitting diode OLED is lit when supplied with acurrent that flows from the terminal to which the first voltage ELVDD isapplied to the terminal to which the second voltage ELVSS is applied.Therefore, the organic light-emitting diode OLED may be unlit while thesecond voltage ELVSS is in a high state, since no current flows from theterminal to which the first voltage ELVDD is applied to the terminal towhich the second voltage ELVSS is applied. On the other hand, theorganic light-emitting diode OLED may be lit while the second voltageELVSS is in a low state, since a current flows from the terminal towhich the first voltage ELVDD is applied to the terminal to which thesecond voltage ELVSS is applied.

That is, referring to FIG. 5, each of the pixels 510 included in theimage apparatus according to the current exemplary embodiment receivesthe second voltage ELVSS, which has a first rising edge R1, a firstfalling edge F1, a second rising edge R2 and a second falling edge F2,and which alternates between a high state and a low state within oneimage frame (one cycle of the vertical synchronization signal Vsync),and is lit or unlit at every first rising edge R1, every first fallingedge F1, every second rising edge R2, and every second falling edge F2of the second voltage ELVSS. While an exemplary circuit of one of thepixels 510 of the image apparatus according to the current exemplaryembodiment is illustrated in FIG. 4, the present invention is notlimited to the exemplary circuit. The configuration of the circuit mayvary as desired.

Referring back to FIG. 3, the voltage generator 450 included in theimage apparatus according to the current exemplary embodiment may alsoprovide the above-described second voltage ELVSS to the timingcontroller 420. When receiving the second voltage ELVSS, the timingcontroller 420 may provide the feedback control signal CONT_F, whichreflects the state of the second voltage ELVSS, to the image signalcontroller 410. The image signal controller 410 may receive the feedbackcontrol signal CONT_F, and may transmit the feedback signal CONT_IR,which is synchronized with the first rising edge R1 of the secondvoltage ELVSS, as shown in FIG. 5, to the IR signal transmitter 100.When necessary, the timing controller 420 may also provide the feedbacksignal CONT_IR, which is synchronized with the first rising edge R1 ofthe second voltage ELVSS, directly to the IR signal transmitter 100without passing through the image signal controller 410, as describedabove.

The IR signal transmitter 100, which receives the feedback signalCONT_IR, may output an IR signal IRsync based on the received feedbacksignal CONT_IR. Specifically, the IR signal transmitter 100 may receivethe feedback signal CONT_IR and output the IR signal IRsync, which risesat the first rising edge R1 of the second voltage ELVSS to remain in ahigh state, and which falls at the second rising edge R2 of the secondvoltage ELVSS to remain in a low state, as shown in FIG. 5.

The process in which the IR signal IRsync is transmitted to shutterglasses 250 including a shutter controller 200 (see FIG. 1), a leftshutter 230, and a right shutter 240, and in which the IR signal IRsyncopens or closes the left shutter 230 and the right shutter 240, has beendescribed above in relation to the shutter control system 300 accordingto the exemplary embodiment of FIG. 1, and thus, any repetitivedescription thereof will be omitted.

Referring to FIG. 5, a section t_on/off_(—)1, in which the left shutter230 is opened while the right shutter 240 is closed, is a sectionbetween the first rising edge R1 and the first falling edge F1 of thesecond voltage ELVSS, and a section t_on/off_(—)2, in which the rightshutter 240 is opened while the left shutter 230 is closed, is a sectionbetween the second rising edge R2 and the second falling edge F2 of thesecond voltage ELVSS. That is, the organic light-emitting diode OLED isunlit in both of the above two sections.

Therefore, even when the display unit 500 included in the imageapparatus according to the current exemplary embodiment alternatelydisplays a right-eye image R and a left-eye image L on each of thepixels 510 in one image frame, as shown in FIG. 6, since the opening orclosing of the left shutter 230 and the right shutter 240 occurs in alight-off section, during which the left-eye image L and the right-eyeimage R are not displayed, 3D crosstalk caused by a response time d of ashutter to the IR signal IRsync, and the on/off speed (t_on/t_off) ofthe shutter itself, can be reduced or minimized.

Likewise, even when the display unit 500 according to a modifiedembodiment divides one image frame into two subframes, as shown in FIG.7, and displays a right-eye image R and a left-eye image L separately,since the opening or closing of a left shutter 230 and a right shutter240 occurs in a light-off section, during which the left-eye image L andthe right-eye image R are not displayed, 3D crosstalk caused by aresponse time d of a shutter to the IR signal IRsync, and the on/offspeed (t_on/t_off) of the shutter itself, can be reduced or minimized.

Hereinafter, an image apparatus according to another exemplaryembodiment of the present invention will be described with reference toFIGS. 5 through 8.

FIG. 8 is a block diagram of an image apparatus according to anotherexemplary embodiment of the present invention. A detailed description ofelements identical to the above-described elements of the shuttercontrol system 300 according to the exemplary embodiment of FIG. 1, andthe image apparatus according to the previous exemplary embodiment, willbe omitted, and the differences between the embodiments will bedescribed below.

Referring to FIG. 8, the image apparatus according to the currentexemplary embodiment may further include a remote control 600.

The remote control 600 may receive information about a delay time from auser, and may transmit a delay time control signal CONT_a to an imagesignal controller 410. When receiving the delay time control signalCONT_a, the image signal controller 410 may provide a feedback signalCONT_IR, which reflects the delay time, to an IR signal transmitter 100.

Here, the delay time input by the user may be an interval a between afalling edge of a vertical synchronization signal Vsync and a firstrising edge R1 of a second voltage ELVSS, as shown in FIG. 5. That is,in the current exemplary embodiment, the image signal controller 410provides the feedback signal CONT_IR, which is synchronized with thefirst rising edge R1 of the second voltage ELVSS, to the IR signaltransmitter 100 based on the delay time a input by the user, instead ofreceiving the second voltage ELVSS from a voltage generator 450 andproviding the feedback signal CONT_IR, which is synchronized with thefirst rising edge R1 of the second voltage ELVSS, to the IR signaltransmitter 100.

The user may input the delay time a in units of 0.01 to 0.05 ms, and thedelay time a may have a positive or negative value (e.g., the IR signalIRsync may be either after or before the falling edge of the verticalsynchronization signal Vsync). An IR signal IRsync is shifted from astarting point of one image frame (the falling edge of the verticalsynchronization signal Vsync) to the left or right by this positive ornegative delay time a input by the user. Therefore, the IR signal IRsynccan be synchronized with the first rising edge R1 of the second voltageELVSS. Since the image apparatus operates in the same manner as theabove-described embodiments, its 3D crosstalk can be reduced orminimized.

While the present invention has been particularly shown and describedwith reference to exemplary embodiments thereof, it will be understoodby those of ordinary skill in the art that various changes in form anddetail may be made therein without departing from the spirit and scopeof the present invention as defined by the following claims and theirequivalents. The exemplary embodiments should be considered in adescriptive sense and not for purposes of limitation.

What is claimed is:
 1. A shutter control system comprising: an infrared(IR) signal transmitter configured to receive from a display device fordisplaying two or more light-off sections and two or more light-onsections arranged alternately in one image frame, informationcorresponding to the light-off sections and the light-on sections, andto output an IR signal corresponding to the information, the IR signalcorresponding to a start of a first light-off section of the light-offsections in the image frame; and a shutter controller configured toreceive the IR signal, and to control opening or closing of a leftshutter and a right shutter in accordance with the IR signal.
 2. Theshutter control system of claim 1, wherein the one image frame comprisesthe first light-off section, a first light-on section, a secondlight-off section, and a second light-on section arranged sequentiallyin this order, and wherein a rising edge of the IR signal corresponds tothe start of the first light-off section.
 3. The shutter control systemof claim 2, wherein the shutter controller is configured to control theleft shutter to be opened while controlling the right shutter to beclosed when the IR signal is in a high state, and is configured tocontrol the right shutter to be opened while controlling the leftshutter to be closed when the IR signal is in a low state.
 4. Theshutter control system of claim 3, wherein a section in which the leftshutter is opened while the right shutter is closed overlaps the firstlight-off section, and a section in which the right shutter is openedwhile the left shutter is closed overlaps the second light-off section.5. An image apparatus comprising: a voltage generator configured togenerate a first voltage and a second voltage, the second voltage havingtwo or more high states and two or more low states in one image frame; adisplay unit comprising a plurality of pixels configured to receive thefirst and second voltages, a data signal, and a gate signal, andconfigured to be lit or unlit corresponding to the first and secondvoltages, the data signal, and the gate signal; a controller configuredto receive information about a delay time from a user and to output afeedback signal corresponding to the information; an IR signaltransmitter configured to receive the feedback signal and to output anIR signal, the IR signal corresponding to at least one of a rising edgeor a falling edge of the second voltage; and shutter glasses comprisinga left shutter, a right shutter, and a shutter controller configured toreceive the IR signal, and to control opening or closing of the leftshutter and the right shutter corresponding to the IR signal.
 6. Theimage apparatus of claim 5, wherein each of the pixels is configured tobe unlit when receiving the second voltage in the high state, and isconfigured to be lit when receiving the second voltage in the low state.7. The image apparatus of claim 6, wherein the first voltage comprisesELVDD, and the second voltage comprises ELVSS.
 8. The image apparatus ofclaim 5, wherein the controller is configured to receive user inputtedinformation corresponding to the delay time in units of 0.01 to 0.05 ms.9. The image apparatus of claim 8, wherein, the controller is configuredto output the feedback signal upon receiving the user inputtedinformation, the feedback signal being shifted from a starting point ofthe image frame by the delay time.